3. Install Of Custom TWRP Recovery in Nexus 7:

Open the folder C:\fastboot\win32\ and Press & hold Shift button and press Right Click of mouse and select Open Command Window Here.

Now type adb reboot bootloaderin cmd for booting your device into bootloader mode OR you boot it by pressing & hold Volume Down + Power Button.

Now when your device Bootloader mode connect it to PC with USB cable.

Type fastboot flash recovery recovery.imgand hit Enter.

Custom Recovery will be flashed to device.

4. How To Root Nexus 7:

Download SuperSU package from Download Section above.

Copy it to the Root of Internal/External memory.

Connect you device to PC with USB Cable.

Open the folder C:\fastboot\win32\ and Press & hold Shift button and press Right Click of mouse and select Open Command Window Here.

Now type adb reboot recoveryin cmd for booting your device into bootloader mode OR you boot it by pressing & hold Volume Down + Power Button and you are in Bootloader Mode now press Volume Down twice and select Recovery Mode by pressing Power Button.

Select Install in Recovery Mode,Now locate & Select SuperSU zip file.

Now Swipe to Confirm Flash (It is for confirmation Swipe it).

It take less than a minute to process and you should see a Success message.